#include <cstdio>
int main(){
  // FILE * fp;
  // fp = fopen("/home/zaizai/haha.txt","wb+");
  // char buf[8191]={0};
  // int fwritereturn;
  // int freadreturn = sprintf(buf,"this is a file!");
  // fwritereturn=fwrite(buf,1,freadreturn,fp);
  // fclose(fp);
  return 0;
}
